Abstract:
Telecommunication is a very important phenomenological technology. Since we are
living in an era of communication explosion. Which is aimed at making this world closer.
Sri Lanka telecom has a reputed history as the national telecommunication service
provider in the country.
Local telecommunication technology and International telecommunication are major
fragments of the Sri Lanka. Telephone that consists transmitter circuit, receiver circuit
and local exchanges are the major components of local telecommunication system. The
transmitter circuit couples the input massage signal to the channel. While it may some
times be possible to couple the input transducer directly to the channel, it is often
necessary to process and modify the input signal for efficient transmission over the
channel. Signal processing operations performed by the transmitter include amplification,
filtering and modulation process and the main function of the receiver is to extract the
input message signal from the degraded version of the transmitted signal coming from the
channel. The receiver performs this function through the process of demodulation, the
reverse of the transmitter’s modulation process. Switching technology method can be
used to distribute local and international voice signal in exchange equipment, voice
signals can propagate Using radio micro waves, pulse code modulation method and
multiplex technology method.
The fundamental components of international telecommunication system arc telephone,
exchanges, ISC (International Switching Center), ITMC (International Transmission
Maintenance Center). As well as there are two types of transmission techniques methods
to propagate the international voice signals. They are satellite technology method and
fiber optic cable technology method which the signal propagate as a light waves. Using
these transmission technologies Sri Lanka is able to propagate international voice signals.
Therefore every type of voice signals can propagate more efficiency using above
methods.
